Packing for piston-valves.



J. T. WILSON. PACKING FOB. PISTON VALVES.

APPLICATION FILED NOV.15, 1912.

Patented se t s, 1913.

. "UNITED QTA'TES Sp cification of Lette s Pat nt.

it A T ENT ()FFICE.

1. BSEY SHCRE. PENNSYLVANIA.

PACKING FOR riswonvnnvns.

Patented Sent. 3. 2.)!

Ailptlbdilull filed November '15. 1912. Serial No. 731.537.

and-[State of Pennsylvania, have invented should air-edge of ar'ing forming part of sa'idpacki'fig be excessively expanded or projected into a port far enough to cat-chor engage theedge of the metal bounding the 'port'the' entire packing cannot be broken or" disarrai'iged sutli'cien'tly to render the valve lnp'perative and prevent the locon'i'otive from dra wing'the train to its 'des'trnat on or to a pl'ade'wherc' another locomotive may be sub stituted.

To'theattainment of this end the invention consists in fashioning the packing rings with grogn'es, and inner vbeveled edges, the groove in a packing ring extending entirely around the same and located a suitable distance from its outer edge, threesixt'eenths of an inch more or less, said groove preferably being bounded by a vertical surface and a surface disposed to the said vertical surface at an angle of 45 degrees, and the inner beveled edge of a ring being located adjacent to the edge of a bull ring, or in a semi-plug valve adjacent to the edge of a wide or central ring, which latter may also have its edges beveled, the angle of the beveled edges being 45 degrees more or less. By reason of this particular or similar construction of the rings, should the edge of a ring from any cause whatsoever be'excessively expanded or forced outwardly far enough into a port to catch the metal bounding the edge of the same, a short portion of the edge of the packing ring will be broken or torn off and the beveled surface bounding the groove adjacent to the line of breakage will force the ring back to its normal position within the cage and the entire packing not be broken and rendered inoperative. Furthermore, should the beveled inner edge of a ring be expanded or projected beyond its normal po sition, the beveled surface at the edge e ngaging the metal bounding the port will force the ring back to its proper position without breaking the ring or disarranging the packing as a whole.

The accompanying drawing illustrates the physical embodiment of the invention in connection with three spe es or types of packing rings, the same being constructed according to the best modes of procedure I have so far devised for the purpose, but the invention may be embodied in connection with other types of valve pac'kings when so i l desired. 7 jlhe'obj'ectof the invention is the provision of a packing'so constructed that Figure l is a section of part of a semi plug piston valve showing the grooves in the two packing rings, the inner beveled edges of the same, and the beveled edges of a wide or inter-mediate ring. Fig. 2 is a section of another type of packing having a bull ring and L-shaped or flanged packing rings, each with a groove and an inner beveled edge.

Fig. 3 is ,a plan view of part of the exterior surface of the packing illustrated by Fig. 2.

Fig. 4 is a section of a piston valve having packing rings which are substantial y rectangular in cross section.

Referring to all the figures, the letter A designates part of the spool of the piston alve; B, the follower; the recess between the flanges of a. spool and follower within which the packing is confined; D, the expzrnsible packing rings, each having a lap joint of any suitable construction; E, the circumferential grooves in the packing rings, each groove preferably being bounded by a vertical surface 1 and a beveled surface 2 disposed to the said vertical surface at an angle of about 45 degrees, and F designates the inner beveled edges of the packing rings, the surface of the bevel in each example be ing at an angle of about 45 degrees to a vertical plane taken at right angles to the length of the valve.

In Fig. 1 integral wall rings G, an expansible wedge ring H, and an-expansible wide rin T are shown in section, the same constituting parts of a semi-plug valve. The wide ring I has its edges J beveled where said edges meet the edges of the snap rings, the surfaces of the bevels being approximately at angles of 45 degrees to the length of the valve.

In Figs. 2 and 4 bull rings K. of a .well known construction are shown which carry the snap or packing rings.

In Figs. 1 and 2 the vertical and oblique surfaces defining the grooves are joined by horizontal surfaces L, and in Fig. 4 the surfaces m'eet. Howe er, the size or dimensions of the grooves and the angular dispositions of the surfaces defining the same may be varied in the embodiment of the invention. The construction and arrangement should be such that a part of the edge of a packing ring may be broken oil and the beveled surface bounding the groove force the ring back to its normal p sition within the ('flgn", without deranging the packing sufficiently to render the valve entirely inoperative, and modifications of shape and dimensions ma}- be adopted to attain the desir d end without constituting substantial departures.

From the description and illustrations of the embodiments of the invention it will be clear that packing rings provided with safety grooves and beveled edges will prevent the breaking or derangement of piston valve packings snfiiciently to render them permanently inoperative.

What I claim is:

1. A iston valve having a packing ring provide with a circumferential groove in its exterior surface and near one of its edges, one surface defining the groove being a beveled surface.

Q. A piston valve having a packing ring provided with a circumferential groove de- J fined by a vertical surface and a surface at two expansible rings and an intermediate ring, each of said expansihle rings having a circumferential groove in the exterior surface thereof located adjacent to its outer edge and one of the surfaces defining the groove being a beveled surfacev 5. A piston valve havin two expansible rings. the exterior inner e go of each being beveled. for the purpose set forth.

6. A piston valve having two nxpansihln rings and an intermediate ring. the exterior edges of the expansible rings adjacent to the intermediate ring having beveled surfaces.

7. A piston valve having an expansible ring with a circumferential groove in the body thereof and one of the exterior edges of said ring beveled.

8. A piston valve havingtwo expansible rings, each with an inner beveled edge F, and an intermediate ring with beveled edges J J adjacent to the said beveled edges of tho expansible rings.

9, A piston valve having two expansible rings, each with a circumferential groove therein adjacent to its outer edge and a beveled exterior inner edge, and an intermediate ring with beveled edges adjacent to the said beveled edges of the expansible rings.

In testimonv whereof I allix my signature.

i presence 0 two witnesses.

JOHN '1'. WILSON.

Witnesses ALLEN J. Fnan'rz, W. B. HARLAN. 

